<!-- 登录页 -->

<script setup>
import { userRegisterSerrvice, userLoginService } from '@/api/user.js' //导入接口方法
import { User, Lock } from '@element-plus/icons-vue' //导入ele小图标
import { ref, watch } from 'vue'
import { useUserStore } from '@/stores' //导入库中方法
import { useRouter } from 'vue-router' //导入router

const isRegister = ref(false)
const form = ref() //初始form实例，空的(ref函数是为了响应式)
//整个的用于提交的form对象
const formModel = ref({
  username: 'chenger',
  password: '123456',
  repassword: ''
})
//整个表单的校验规则
//1.非空校验 required:true,trigger触发校验的时机blur或change
//2.长度校验 min、max
//3.正则校验 pattern:正则规则 \S表示非空字符
//4.自定义校验 => 自己写逻辑校验(校验函数)  //基于Eml官方文档
//  validator:(rule,value,callback)
//      (1)rule 当前校验相关的信息
//      (2)value 所校验的表单元素目前的表单值
//      (3)callback 无论成功还是失败，都需要callback回调
//          - callback()校验成功
//          - callback(new Error(错误信息)) 校验失败
const rules = {
  username: [
    { required: true, message: '请输入用户名', trigger: 'blur' },
    { min: 5, max: 10, message: '用户名必须是5-10位的字符', trigger: 'blur' }
  ],
  password: [
    { required: true, message: '请输入密码', trigger: 'blur' },
    {
      pattern: /^\S{6,15}$/,
      message: '密码必须是6-15位的非空字符',
      trigger: 'blur'
    }
  ],
  repassword: [
    { required: true, message: '请输入密码', trigger: 'blur' },
    {
      pattern: /^\S{6,15}$/,
      message: '密码必须是6-15位的非空字符',
      trigger: 'blur'
    },
    {
      //自定义校验规则
      validator: (rule, value, callback) => {
        //判断value和当前form中收集的password是否一致
        if (value !== formModel.value.password) {
          callback(new Error('两次输入的密码不一致'))
        } else {
          callback() //就算校验成功了，也需要callback
        }
      },
      trigger: 'blur'
    }
  ]
}
//方法
//form是ref()实例，

//点击注册按钮调用此方法，调用form.value.validata(),会返回一个promise(官方文档)
const register = async () => {
  //注册成功之前，先进行校验，校验成功→发请求，校验失败→自动提示
  await form.value.validate()
  //调用注册接口
  await userRegisterSerrvice(formModel.value)
  ElMessage.success('注册成功')
  isRegister.value = false //切换至登录表单
}

//登录操作
const userStore = useUserStore()
const router = useRouter()
//点击登录按钮调用此方法
const login = async () => {
  //ref="form",form是el-form的实例，valiadte()是内置的方法
  await form.value.validate()
  //接收调用登录api返回的数据
  const res = await userLoginService(formModel.value)
  //console.log(res) //看看调用登录api返回的啥数据
  userStore.setToken(res.data.token)
  ElMessage.success('登录成功')
  router.push('/')
}

//切换表单时，清空表单内容
watch(isRegister, () => {
  formModel.value = {
    username: '',
    password: '',
    repassword: ''
  }
})
</script>

<template>
  <!-- el-row、el-col和:span
        el-row表示一行，一行分成24份
        el-col表示列,:span="12"表示一行中占12份
     -->
  <el-row class="login-page">
    <!-- 背景图 :span="12"表示一行中占12份，即占一半-->
    <el-col :span="12" class="bg"></el-col>
    <!-- :span="6"表示一行中占六份，本应贴着上面的背景图，
         :offset="3"表示一行中，左侧margin份数 -->
    <el-col :span="6" :offset="3" class="form">
      <!-- el-form 整个表单组件
           el-form-item 表单的一行 -->

      <!--2、校验功能相关
        2.1 ：el-form =>:model=“ruleForm”绑定的整个form的数据对象
        2.2 : el-form =>:rules="rules"   绑定的整个rules规则对象
        2.3 ：表单元素 =>v-model="ruleForm.xxx"给表单元素，绑定form的子属性
        2.4 ：el-form-item =>prop配置生效的是哪个校验规则（对应rules中的字段）
      -->

      <!-- 下面是注册的表单 -->
      <el-form
        :model="formModel"
        :rules="rules"
        ref="form"
        size="large"
        autocomplete="off"
        v-if="isRegister"
      >
        <el-form-item>
          <h1>注册</h1>
        </el-form-item>
        <el-form-item prop="username">
          <el-input
            v-model="formModel.username"
            :prefix-icon="User"
            placeholder="请输入用户名"
          ></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input
            v-model="formModel.password"
            :prefix-icon="Lock"
            type="password"
            placeholder="请输入密码"
          ></el-input>
        </el-form-item>
        <el-form-item prop="repassword">
          <el-input
            v-model="formModel.repassword"
            :prefix-icon="Lock"
            type="password"
            placeholder="请输入再次密码"
          ></el-input>
        </el-form-item>
        <el-form-item>
          <el-button
            @click="register"
            class="button"
            type="primary"
            auto-insert-space
          >
            注册
          </el-button>
        </el-form-item>
        <el-form-item class="flex">
          <el-link type="info" :underline="false" @click="isRegister = false">
            ← 返回
          </el-link>
        </el-form-item>
      </el-form>
      <!-- 登录的表单 -->
      <el-form
        :model="formModel"
        :rules="rules"
        ref="form"
        size="large"
        autocomplete="off"
        v-else
      >
        <el-form-item>
          <h1>登录</h1>
        </el-form-item>
        <el-form-item prop="username">
          <el-input
            v-model="formModel.username"
            :prefix-icon="User"
            placeholder="请输入用户名"
          ></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input
            v-model="formModel.password"
            name="password"
            :prefix-icon="Lock"
            type="password"
            placeholder="请输入密码"
          ></el-input>
        </el-form-item>
        <el-form-item class="flex">
          <div class="flex">
            <el-checkbox>记住我</el-checkbox>
            <el-link type="primary" :underline="false">忘记密码？</el-link>
          </div>
        </el-form-item>
        <el-form-item>
          <el-button
            @click="login"
            class="button"
            type="primary"
            auto-insert-space
            >登录</el-button
          >
        </el-form-item>
        <el-form-item class="flex">
          <el-link type="info" :underline="false" @click="isRegister = true">
            注册 →
          </el-link>
        </el-form-item>
      </el-form>
    </el-col>
  </el-row>
</template>

<style lang="scss" scoped>
.login-page {
  height: 100vh;
  background-color: #fff;
  .bg {
    background:
      url('@/assets/logo2.png') no-repeat 60% center / 240px auto,
      url('@/assets/login_bg.jpg') no-repeat center / cover;
    border-radius: 0 20px 20px 0;
  }
  .form {
    display: flex;
    flex-direction: column;
    justify-content: center;
    user-select: none;
    .title {
      margin: 0 auto;
    }
    .button {
      width: 100%;
    }
    .flex {
      width: 100%;
      display: flex;
      justify-content: space-between;
    }
  }
}
</style>
